/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/


#ifndef Joystick_H
#define Joystick_H

#include <QObject>
#include <QThread>

#include "QGCLoggingCategory.h"
#include "Vehicle.h"
#include "MultiVehicleManager.h"

Q_DECLARE_LOGGING_CATEGORY(JoystickLog)
Q_DECLARE_LOGGING_CATEGORY(JoystickValuesLog)

class Joystick : public QThread
{
    Q_OBJECT

public:
    Joystick(const QString& name, int axisCount, int buttonCount, int hatCount, MultiVehicleManager* multiVehicleManager);

    ~Joystick();

    typedef struct Calibration_t {
        int     min;
        int     max;
        int     center;
        int     deadband;
        bool    reversed;
        Calibration_t()
            : min(-32767)
            , max(32767)
            , center(0)
            , deadband(0)
            , reversed(false) {}
    } Calibration_t;

    typedef enum {
        rollFunction,
        pitchFunction,
        yawFunction,
        throttleFunction,
        gimbalPitchFunction,
        gimbalYawFunction,
        maxFunction
    } AxisFunction_t;

    typedef enum {
        ThrottleModeCenterZero,
        ThrottleModeDownZero,
        ThrottleModeMax
    } ThrottleMode_t;

    Q_PROPERTY(QString  name                READ name                   CONSTANT)
    Q_PROPERTY(bool     calibrated          MEMBER _calibrated          NOTIFY calibratedChanged)
    Q_PROPERTY(int      totalButtonCount    READ totalButtonCount       CONSTANT)
    Q_PROPERTY(int      axisCount           READ axisCount              CONSTANT)
    Q_PROPERTY(bool     requiresCalibration READ requiresCalibration    CONSTANT)
    Q_PROPERTY(QStringList actions          READ actions                CONSTANT)
    Q_PROPERTY(QVariantList buttonActions   READ buttonActions          NOTIFY buttonActionsChanged)

    Q_PROPERTY(bool     gimbalEnabled       READ gimbalEnabled          WRITE setGimbalEnabled      NOTIFY gimbalEnabledChanged)
    Q_PROPERTY(int      throttleMode        READ throttleMode           WRITE setThrottleMode       NOTIFY throttleModeChanged)
    Q_PROPERTY(float    frequency           READ frequency              WRITE setFrequency          NOTIFY frequencyChanged)
    Q_PROPERTY(bool     negativeThrust      READ negativeThrust         WRITE setNegativeThrust     NOTIFY negativeThrustChanged)
    Q_PROPERTY(float    exponential         READ exponential            WRITE setExponential        NOTIFY exponentialChanged)
    Q_PROPERTY(bool     accumulator         READ accumulator            WRITE setAccumulator        NOTIFY accumulatorChanged)
    Q_PROPERTY(bool     circleCorrection    READ circleCorrection       WRITE setCircleCorrection   NOTIFY circleCorrectionChanged)

    Q_INVOKABLE void    setButtonAction (int button, const QString& action);
    Q_INVOKABLE QString getButtonAction (int button);

    // Property accessors

    QString     name                () { return _name; }
    int         totalButtonCount    () { return _totalButtonCount; }
    int         axisCount           () { return _axisCount; }
    bool        gimbalEnabled       () { return _gimbalEnabled; }
    QStringList  actions            ();
    QVariantList buttonActions      ();

    void setGimbalEnabled           (bool set);

    /// Start the polling thread which will in turn emit joystick signals
    void startPolling(Vehicle* vehicle);
    void stopPolling(void);

    void setCalibration(int axis, Calibration_t& calibration);
    Calibration_t getCalibration(int axis);

    void setFunctionAxis(AxisFunction_t function, int axis);
    int getFunctionAxis(AxisFunction_t function);


/*
    // Joystick index used by sdl library
    // Settable because sdl library remaps indices after certain events
    virtual int index(void) = 0;
    virtual void setIndex(int index) = 0;
*/
	virtual bool requiresCalibration(void) { return true; }

    int throttleMode(void);
    void setThrottleMode(int mode);

    bool negativeThrust(void);
    void setNegativeThrust(bool allowNegative);

    float exponential(void);
    void setExponential(float expo);

    bool accumulator(void);
    void setAccumulator(bool accu);

    bool deadband(void);
    void setDeadband(bool accu);

    bool circleCorrection(void);
    void setCircleCorrection(bool circleCorrection);

    void setTXMode(int mode);
    int getTXMode(void) { return _transmitterMode; }

    /// Set the current calibration mode
    void setCalibrationMode(bool calibrating);

    float frequency();
    void setFrequency(float val);

signals:
    void calibratedChanged(bool calibrated);

    // The raw signals are only meant for use by calibration
    void rawAxisValueChanged(int index, int value);
    void rawButtonPressedChanged(int index, int pressed);

    void buttonActionsChanged(QVariantList actions);

    void throttleModeChanged(int mode);

    void negativeThrustChanged(bool allowNegative);

    void exponentialChanged(float exponential);

    void accumulatorChanged(bool accumulator);

    void enabledChanged(bool enabled);

    void circleCorrectionChanged(bool circleCorrection);

    /// Signal containing new joystick information
    ///     @param roll         Range is -1:1, negative meaning roll left, positive meaning roll right
    ///     @param pitch        Range i -1:1, negative meaning pitch down, positive meaning pitch up
    ///     @param yaw          Range is -1:1, negative meaning yaw left, positive meaning yaw right
    ///     @param throttle     Range is 0:1, 0 meaning no throttle, 1 meaning full throttle
    ///     @param mode     See Vehicle::JoystickMode_t enum
    void manualControl          (float roll, float pitch, float yaw, float throttle, quint16 buttons, int joystickMmode);
    void manualControlGimbal    (float gimbalPitch, float gimbalYaw);

    void buttonActionTriggered(int action);

    void gimbalEnabledChanged   ();
    void frequencyChanged       ();
    void stepZoom               (int direction);
    void stepCamera             (int direction);
    void stepStream             (int direction);
    void triggerCamera          ();
    void startVideoRecord       ();
    void stopVideoRecord        ();
    void toggleVideoRecord      ();
    void gimbalPitchStep        (int direction);
    void gimbalYawStep          (int direction);
    void centerGimbal           ();
    void setArmed               (bool arm);
    void setVtolInFwdFlight     (bool set);
    void setFlightMode          (const QString& flightMode);

protected:
    void    _setDefaultCalibration  ();
    void    _saveSettings           ();
    void    _loadSettings           ();
    float   _adjustRange            (int value, Calibration_t calibration, bool withDeadbands);
    void    _buttonAction           (const QString& action);
    bool    _validAxis              (int axis);
    bool    _validButton            (int button);

private:
    virtual bool _open      ()          = 0;
    virtual void _close     ()          = 0;
    virtual bool _update    ()          = 0;

    virtual bool _getButton (int i)      = 0;
    virtual int  _getAxis   (int i)      = 0;
    virtual bool _getHat    (int hat,int i) = 0;

    void _updateTXModeSettingsKey(Vehicle* activeVehicle);
    int _mapFunctionMode(int mode, int function);
    void _remapAxes(int currentMode, int newMode, int (&newMapping)[maxFunction]);

    // Override from QThread
    virtual void run();

protected:

    enum {
        BUTTON_UP,
        BUTTON_DOWN,
        BUTTON_REPEAT
    };

    uint8_t*_rgButtonValues         = nullptr;

    bool    _exitThread             = false;    ///< true: signal thread to exit
    bool    _calibrationMode        = false;
    int*    _rgAxisValues           = nullptr;
    Calibration_t* _rgCalibration   = nullptr;
    ThrottleMode_t _throttleMode    = ThrottleModeDownZero;
    bool    _negativeThrust         = false;
    float   _exponential            = 0;
    bool    _accumulator            = false;
    bool    _deadband               = false;
    bool    _circleCorrection       = true;
    float   _frequency              = 25.0f;
    Vehicle* _activeVehicle         = nullptr;
    bool    _gimbalEnabled          = false;

    bool    _pollingStartedForCalibration = false;

    QString _name;
    bool    _calibrated;
    int     _axisCount;
    int     _buttonCount;
    int     _hatCount;
    int     _hatButtonCount;
    int     _totalButtonCount;

    static int          _transmitterMode;

    int                 _rgFunctionAxis[maxFunction] = {};

    QStringList         _rgButtonActions;

    MultiVehicleManager* _multiVehicleManager = nullptr;

private:
    static const char*  _rgFunctionSettingsKey[maxFunction];

    static const char* _settingsGroup;
    static const char* _calibratedSettingsKey;
    static const char* _buttonActionSettingsKey;
    static const char* _throttleModeSettingsKey;
    static const char* _exponentialSettingsKey;
    static const char* _accumulatorSettingsKey;
    static const char* _deadbandSettingsKey;
    static const char* _circleCorrectionSettingsKey;
    static const char* _frequencySettingsKey;
    static const char* _txModeSettingsKey;
    static const char* _fixedWingTXModeSettingsKey;
    static const char* _multiRotorTXModeSettingsKey;
    static const char* _roverTXModeSettingsKey;
    static const char* _vtolTXModeSettingsKey;
    static const char* _submarineTXModeSettingsKey;
    static const char* _gimbalSettingsKey;

    static const char* _buttonActionArm;
    static const char* _buttonActionDisarm;
    static const char* _buttonActionToggleArm;
    static const char* _buttonActionVTOLFixedWing;
    static const char* _buttonActionVTOLMultiRotor;
    static const char* _buttonActionZoomIn;
    static const char* _buttonActionZoomOut;
    static const char* _buttonActionNextStream;
    static const char* _buttonActionPreviousStream;
    static const char* _buttonActionNextCamera;
    static const char* _buttonActionPreviousCamera;
    static const char* _buttonActionTriggerCamera;
    static const char* _buttonActionStartVideoRecord;
    static const char* _buttonActionStopVideoRecord;
    static const char* _buttonActionToggleVideoRecord;
    static const char* _buttonActionGimbalDown;
    static const char* _buttonActionGimbalUp;
    static const char* _buttonActionGimbalLeft;
    static const char* _buttonActionGimbalRight;
    static const char* _buttonActionGimbalCenter;

private slots:
    void _activeVehicleChanged(Vehicle* activeVehicle);
};

#endif
